March 6th 2015 FDA approved Sandoz’s Zarxio (filgrastim-sndz) on March 6, 2015. The approval is a groundbreaking decision, as Sandoz is the first pharmaceutical company to have a biosimilar product approved in the United States. Known as Zarzio outside of the US, Sandoz says its biosimilar filgrastim is already available in more than 60 countries worldwide, has generated more than 7.5 million patient-days of exposure, and is "the most widely used filgrastim in Europe."